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# Function acos
Calculate the inverse cosine of a value.
For matrices, the function is evaluated element wise.
## Syntax
```js
math.acos(x)
```
### Parameters
Parameter | Type | Description
--------- | ---- | -----------
`x` | number | BigNumber | Complex | Array | Matrix | Function input
### Returns
Type | Description
---- | -----------
number | BigNumber | Complex | Array | Matrix | The arc cosine of x
## Examples
```js
math.acos(0.5) // returns number 1.0471975511965979
math.acos(math.cos(1.5)) // returns number 1.5
math.acos(2) // returns Complex 0 + 1.3169578969248166 i
```
## See also
[cos](cos.md),
[atan](atan.md),
[asin](asin.md)